Note 6 - Income Taxes (Tables)

12 Months Ended

Dec. 31, 2020

Notes Tables

Schedule of Components of Income Tax Expense (Benefit) [Table Text Block]

	2020			2019			2018
Current:
Domestic	$	(868	)	$	(701	)	$	(454	)
Foreign		(6,355	)		(7,289	)		(4,382	)
Total current income tax provision		(7,223	)		(7,990	)		(4,836	)
Deferred:
Domestic		4,392			15,243			7,147
Foreign		2,696			16,848			4,390
Total deferred income tax benefit		7,088			32,091			11,537
Total income tax (provision) benefit	$	(135	)	$	24,101		$	6,701

Schedule of Income before Income Tax, Domestic and Foreign [Table Text Block]

	2020			2019			2018
Domestic	$	(2,104	)	$	(49,874	)	$	(44,513	)
Foreign		(14,551	)		(73,784	)		11,249
Total	$	(16,655	)	$	(123,658	)	$	(33,264	)

Schedule of Effective Income Tax Rate Reconciliation [Table Text Block]

	2020					2019					2018
Computed “statutory” benefit (provision)	$	3,498		21	%	$	25,968		21	%	$	6,986		21	%
Percentage depletion		5,327		32			3,030		2			3,158		10
Change in valuation allowance		786		5			686		1			(2,304	)	(7	)
State taxes, net of federal tax benefit		(1,164	)	(7	)		2,648		2			(849	)	(3	)
Foreign currency remeasurement of monetary assets and liabilities		(4,824	)	(29	)		(8,629	)	(7	)		6,747		20
Rate differential on foreign earnings		991		6			3,947		3			(469	)	(1	)
Compensation		(458	)	(3	)		(1,056	)	(1	)		(970	)	(3	)
Foreign withholding taxes		—		—			—		—			278		1
Mining and other taxes		(3,572	)	(22	)		(1,242	)	(1	)		(3,501	)	(11	)
Other		(719	)	(4	)		(1,251	)	(1	)		(2,375	)	(7	)
Total (provision) benefit	$	(135	)	(1	)%	$	24,101		19	%	$	6,701		20	%

Schedule of Deferred Tax Assets and Liabilities [Table Text Block]

	December 31,
	2020			2019
Deferred tax assets:
Accrued reclamation costs	$	32,938		$	30,038
Deferred exploration		11,623			13,762
Foreign net operating losses		13,303			12,013
Domestic net operating losses		198,438			175,024
Pension and benefit obligation		12,341			13,866
Foreign exchange loss		19,808			21,719
Foreign tax credit carryforward		3,358			4,149
Miscellaneous		18,385			30,871
Total deferred tax assets		310,194			301,442
Valuation allowance		(77,210	)		(86,634	)
Total deferred tax assets		232,984			214,808
Deferred tax liabilities:
Miscellaneous		(2,551	)		(904	)
Properties, plants and equipment		(359,996	)		(348,649	)
Total deferred tax liabilities		(362,547	)		(349,553	)
Net deferred tax liability	$	(129,563	)	$	(134,745	)

Summary of Positions for which Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Table Text Block]

	2020			2019			2018
Balance at beginning of year	$	(86,634	)	$	(94,981	)	$	(78,684	)
Valuation allowance on deferred tax assets acquired with the Klondex acquisition		—			5,905			(11,470	)
Decrease related to non-recognition of deferred tax assets due to uncertainty of recovery and (increase) related to non-utilization of net operating loss carryforwards		786			686			(5,700	)
Decrease related to utilization and expiration of deferred tax assets, other		8,638			1,756			873
Balance at end of year	$	(77,210	)	$	(86,634	)	$	(94,981	)